I like Mason better than Gio Bernard, although I did like him too. Mason is one of the better backs we've seen in the last few years IMO, and I think he's going to be very good in the pros.
He has some power but he's shifty too. Overall, a good combo of power and quickness.
I think he is going to fall in an area where he won't be available to Dallas. He will probably be there at the 16th pick, but they won't use a first on him, and they shouldn't because the defensive line is such a huge need. But he's good enough where he will probably go in the late first round or early in the second round... which will see him taken before Dallas has its second pick. Even though it could change before the draft gets here, I don't see him lasting until the Cowboys second round pick.
Dallas could move up in the second and take him if he's there... but they won't do that either.
So, even though I really like him and think he'll be a star in the league, I don't really see any way he will be a Cowboy... and that is a shame.